Multistage centrifugal pump



' A. HOLLANDER MULTISTAGE CENTRIFUGAL PUMP Filed March 2 1924 Fla! ( 7hum/ ATTORNE S.

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l atented Feha ld, 1925.

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ALADAR HOLLANDER, OF

BERKELEY, GALIFQRNIA...

MULTISTAGE CENTRIFUGAL BUMP.

Application filed March 27,

To all whom it may concern:

Be it known that I, ALADAR HOLLANDER, a citizen of the United States,and resident of the city of Berkeley, county of Alameda, State ofCalifornia, have invented new and useful ln'iproven'ients in MultistageCentrifugal Pumps, of which the following is a specification.

The object of my invention is the arrangement of parts and passages in amulti-stage centrifugal pump whereby the several parts may be readilyassembled or dismantled with the greatest ease, and whereby the machineoperations are simplified and cheapened and, tie operationandmaintenance conditions improved.

Other objects will appear from the drawings and specifications whichfollow.

These objects l accomplish by arranging a pluralityof impellers so thattheir suction inlets are right and left respectively and intcrposingbetween the said impellers a dia-. phragm member of greater. diameterthanthe impeller which it encloses.

This diaphragm is of circular shape and adapted to be bolted orotherwise suitablyl'astened within a circular opening in the casing andbetween the impellers thus dividing the pressure stages, of the pumpOpposite the outside of one of the impellers and preferably on the highpressure side it introduce a cover adapted to close another opening inthe casing large enough topass freely the diaphragm and the im ellers.

The impellers are fixed together y screw threads and are secured to thedriving shaft by spline or key let into the shaft and having a head orupset portion which is clamped between the two impellers when they arescrewed together. ltn this way the impellers are held firmly fromslipping in any direction on the shaft, and upon removing one side ofthe pump case the impellers and the shaft may be readily removed withoutdisturbing the discharge and suction connection to the casing.

By referring to the accompanying drawings and specifications myinvention will be made clear.

Fig. l is a cross section through a two stage centrifugal pump in whichmy invention has been incorporated.

2 is an end View of the pump in llligt l.

channel in the cover 4, to the .Jlhe impeller 1924. Serial Ito. 702,2d2.

Fig. 3 is a view taken from the other end of the pump in Fig. l.

Throughout the figures similar numerals refer to identical parts.

A suction inlet of the pump is shown by the numeral 1, from which thewater is taken up by theimpeller 2 and discharged into the low pressurevolute passage 3, from which it is delivered through the annularimpeller 5. 5 in turn discharges high pressure water 'into the volute 6and the water passes thence through the discharge outlet 7. I

' At 8 is a diaphragm or disc separating the compartments of differentpressure and filling an opening in the casing. Through carrying with itthe shaft 9, and impeller 5. This is best accomplished by removing thecover t and the screws is releasing the diaphragm 8 which comes out withthe rotating element and without disturbing the casing or any ofthe pipeconnections. I

The runners are attached to the shaft as follows:

At 20 is shown a key having a gib head 22 let into the shaft an engaginga keyway in the hub of the impeller 2. Thehub is also recessedpreferably by an annular cut 21 to admit the head of the key.

At 23 ll showscrew threads on the hub of the said impeller 2 with whichcorrespending threads on the hub of impeller 5 are adapted to engage.

ltt is of course im Jortant that the direction of rotation of tie shaft9 be such that the threads will tighten due to the torque under theoperating conditions. 'When the impellers are tightened together the hubof impeller-5 bears against the gib head 22 thus binding the twoimpellers in axial relation to each other and to the shaft at the sametime that the key provides the desired lock between the shaft and the.impellers.

In dismantling the unit if it is desired to remove the impellers fromthe shaft the cover 4 is first removed after which the impeller 5- mayhe removed before the dia phragm plate 8 is taken out or it ma be leftin wi its assembled impellers may be thereafter removed.

place on the shaft, and then t e shaft -this opening impeller 2 may bewithdrawn It will now be seen that the rotating parts i may be removedwithout disturbing the inlet or outlet connections 1 and 7 of the easingor disturbing the casing, full access to the interior being attained byemploying my IIIVGDUOD.

I claim:

1. In a multi-stage centrifugal pump having high and low pressureimpellers arranged back to back on a rotatable shaft, a. casing havingan inlet on one side and a discharge outlet on the other side, a coverforming with said casing an intermediate passage, said casing and coverjoined on a plane at right angles to said shaft and a diaphragm adaptedto close an opening in the casing of greater diameter than the impellersand interposed between the impellers and having a running joint with therotatable parts therebetween, the impellers being coupled by screwthreads on their hubs and a spline on said shaft engaging one impellerhub and abutting against the other impeller when the runners are screwedtogether.

2 In a multistage centrifugal pump haring high and low pressureimpellers arranged back to back on av rotatable shaft. a casing havingan inlet on one side and a discharge outlet on the other side, a covert'orming with said casing an intermediate passage, said casing and coverjoined on a plane at right angles to said shaft and a diaphragm adaptedto close an opening in the casing of greater diameter than the impellersand interposed between the impellers and having a running joint with therota table parts therebetween, means coupling the impellers together anda spline on said shaft engaging one impeller hub and abutmamas tingagainst the other impeller when the runners are screwed together.

3. In a multi-stage centrifugal pump having high and low pressureimpellers arranged back to back on a. rotatable shaft, acasing having aninlet on one side and a discharge outlet on the other side, a coverforming 'with said casing an intermediate passage, said casin and coverjoined on a plane at right ang es to said shaft and a diaphragm adaptedto close an opening in the casing of greater diameter than the impellersand interposed between the impellers and having a running joint with therota-- table parts therebetween, the impellers coupled byscrewthreads'on their hubs concentric with said joint and a spline onsaid shaft engaging one impeller hub and abutting against the otherimpeller when the runners are screwed together.

4. In a multistage centrifugal pump having high and low pressureimpellers arranged backto back on a rotatable shaft. a casing having aninlet on one side and a discharge outlet on the other side, a coverforming with said easing an intermediate passage, said casing and coverjoined on a plane at right angles to said shaft and a diaphragm adaptedto close an opening in thecasing of greater diameter than the impellersand interposed between the impellers and having a running joint with therotatable parts therebetween, means coupling the impellers togetherconcentric with said joint and a spline on said shaft engaging oneimpeller hub and abutting against the other impeller when the, runnersare screwed together.

ALADAR HULLANDER

